Coal plant breakdowns and low wind power output force National Grid to pay
dozens of businesses to reduce their energy usage

Britain was forced to rely on new "last resort" measures to keep the lights on for the first time on Wednesday after coal power plants broke down and wind farms produced less than one per cent of required electricity.

National Grid later announced that it had also had to use a scheme called “demand side balancing reserve” (DSBR) to reduce demand on the Grid by about 40 MW.

The scheme was one of two emergency schemes first introduced last year to help cope with Britain’s tightening power margins, as old coal plants are closed down and not replaced.

The second emergency measure, which has so far not been used, would see a reserve of old power plants fired up.

Businesses that volunteer to take part in the DSBR scheme are paid a retainer, in return for agreeing that they will receive additional payments to cut their demand if needed. National Grid has estimated the scheme will cost consumers about 50p a year.

National Grid had previously said that the schemes would only be used "as a last resort in the event that there is insufficient supply available in the market to meet demand". Until Wednesday it had never actually asked businesses taking part to cut their usage.

A NISM is part of our standard toolkit for balancing supply & demand and this is the result of multiple breakdowns https://t.co/CoZzXjxRab

Flexitricity, one of the companies coordinating businesses to take part in the scheme, said commercial energy users had reduced power at 46 sites, mostly by “turning down building ventilation”. This was primarily air conditioning at offices, it said.

A spokesman for National Grid insisted that the measures taken on Wednesday did “not mean we were at risk of blackouts”, only that “we needed the safety cushion of power in reserve to be higher”.

Lisa Nandy, Labour’s shadow energy secretary, blamed Government policy for “creating an energy security crisis” while the GMB Union said Britain was in the “bonkers position… where National Grid is using consumer’s money to pay firms to stop work in order to avoid blackouts”.